Changed UrlGetPartA and UrlGetPartW to return the correct (different) values. (try 2)

[Eric Culp]

The two functions have different return values on windows for analogous inputs.
Changed to match windows behavior.

Also removed the corresponding todo in the test.
---
 dlls/shlwapi/tests/url.c |    2 +-
 dlls/shlwapi/url.c       |   12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)
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